 A member of the Yale Security Group
SERIES 7770 FEATURES
The Norton Series 7770 Door Closer is available in sizes
2 thru 6.
50% Power Adjustment: Closer power can be increased
by 50% over the minimum closing force for each closer size by rotating the 11/16"
high-shouldered nut on the end of the closer spring tube.
Rack & Pinion Operation: Provides a smooth
transmission of power for control of the door through its full opening and closing cycle.
Adjustable Sweep Speed: An independent regulating
valve, hex-key-operated, permits adjustment of the general closing speed.
Adjustable Latch Speed: An independent regulating
valve, hex-key-operated, permits adjustment of the door's latch speed for approximately
the last 5° of the closing cycle.
Adjustable Backcheck Cushioning: An independent
regulating valve, hex-key-operated, provides an adjustable hydraulic cushioning to the
door opening speed toward the end of the opening cycle.
Adjustable Backcheck Positioning: An independent
valve, hex-key-operated, allows adjustment of the point, in the door's opening cycle, at
which backcheck cushioning takes effect. It provides a range of 20° within which
backcheck can be set. The exact range is dependent upon the arm application and templated
position of the closer.
Non-Critical Valves: All control valves for sweep
speed/latch speed and backcheck control are non-critical and are adjusted by a standard
1/8" hex-key.
Security Arms: Main arm is 3/8" thick heavy
steel stamping with a rectangular cross section. Material is 1-1/8" wide with each
end flared to 1 -3/8'. 11 " center to center length.
Secondary arm is 5/16" thick heavy steel stamping with
a rectangular cross section. Material is 1" wide with each end flared to 1
-3/8".
Joints feature permanent, orbital riveted elbow and arm
shoe/soffit plate joints which prevent disassembly. All joints pivot on large 5/8"
diameter stud shafts. The round, low profile, orbital rivet head deters removal with
ordinary hand tools. Oilite bronze bushings are pressed into the bearing surface areas at
the arm shoe or soffit plate joint and at the elbow joint to reduce frictional load and
prevent wear.
The shallow track mount option can be installed on either
the push side or the pull side of the door. It's slim line minimizes vandalism and abuse
CloserPlus arm also available.
Door Stop: Steel arm stop riveted to the soffit plate,
permits door swing to within 2° of nominal template opening.
Door Holder: Optional feature. Spring loaded cup pointed
plunger in the holder mechanism mates with the ball stud on the soffit plate within 2° of
nominal template opening.
Thumbturn Operated Hold-Open: Hex-key actuated mechanism to
engage/disengage optional hold-open. Suffix "T" to the catalog number.
Key Operated Hold-Open: Hex-key actuated mechanism to
engage/disengage optional hold-open. Hex-key control provides a deterrent to unauthorized
actuation of the hold-open mechanism. Suffix "K" to the catalog number.
Security Cover: Extruded heavy duty metal cover
fastens with 4 security mounting screws. Cover is handed.
Security Attachments: All exposed fasteners are
lobular drive TORX screws with center security pin.
Closer Body and Arm Assembly are Non-Handed
Closer Adjustment Decal: A decal is permanently
affixed to the inside of the closer cover. This decal fully details all closer
adjustments.
Warranty
The Series 7770 Door Closer is backed by a 10-year limited
warranty. The aluminum shell is warranted for the lifetime of the building in which it is
originally installed.
Special Feature Closers
 Adjustable
Delayed Action Closing: An optional hydraulic feature that adds a third speed range to
the closing control cycle. This feature becomes effective when the door is opened and
released at any point beyond 70°. This delayed closing enables traffic to clear the
opening before the normal closing cycle starts. This feature is advantageous to the
handicapped and elderly. It is also valuable for wheeled or other traffic where delayed
closing is desirable. Backcheck cushioning and backcheck positioning are standard with all
closers including closers with Adjustable Delayed Action Closing. Order Series 7770DA.
Enhanced Backcheck (EBC): initiates backcheck at
15° instead of the normal 72°. This optional feature is especially useful in prison
installations where the door presents a potential threat for bodily injury. The intensity
of enhanced backcheck is fully adjustable. It is available in place of the standard
adjustable backcheck and backcheck position features.
Mounting Plate No. 7778: Available for a narrow top
rail. Attachments are TORX head screws. See accessories, page 13.
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